SDK version 3.1.1 released yesterday, and it has a lot of performance improvements. In some of my testing, with a tweaked version of your benchmark, I was getting almost an order of magnitude reduction in run time on my laptop. I’d be very interested to know how it performs for you in your test environment.
Note that the main tweak I made to your benchmark was to control the degree of parallelism, as per this example in another post: Bulk Insert In Every Two Minutes